WAEC 2018/2019 biology Theory and Obj Answers Now Available Here [100% Confirmed Runz] Ans one Hours Before The Exam

(1ai)
A sperm cell consists of a head, middle piece and a whip-like tail. At the anterior end of the head is a structure called Acrosome. This Acrosome contains a liquid which facilitates the entry of the sperm into an egg. The middle piece contains numerous mitochondria which are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.

(1aii)
A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves of those that plants that contain them, converting the light to the chemical energy. Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. They allow the passage of gases through the intercellular spaces in them.

(4ai)
Gene is the discrete unit of inheritance which are found in the chromosomes of all cell.

(4aii)
A hybrid is an offspring obtained from the cross-breeding of the species that are not closely related.

(4aiii)
Trait is the characteristic factor of an individual which are hereditary.

(4b)
Draw the diagram
Phenotyoic ratio= 3:1
Genotypic ratio= 1:2:1

(4c)
The four transmittable characters in plants are:
-Height
-Colour
-Shape of fruit
-Size of Leaf

(6ai)
Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight